Method for the manufacturing of circular bottom plates for sheetmetal receptacles



Mme 1? 1924. i,498,30 M. SINGEWALD METHOD FOR THE MANUFACTURING OFCIRCULAR BDM'OM PLATES FOR SHEET METAL REOEPTACLES Filed March 21. 1923Patented June 17, 1924.

MAX SINGEWALD, 0F ZU'CKELHAUSEN, GERMANY.

METHOD FOR THE MANUFACTURING OF CIRCULAR BOTTOM PLATES FOR SHEET- METALRECEPTACLES.

Application filed March 21, 1923. Serial No. 626,579.

T 0 all whom it may concern:

Be it known that I, MAX SINGEWALD, a citizen of the German Reich,residing at Zuckelhausen, Germany, have invented certain new and usefulImprovements in Methods for the Manufacturing of Circular Bottom Platesfor Sheet-Metal Receptacles (for which I have filed an application forpatent in Germany on the 18th of March, 1922), of which the following isa specification.

For making sheet metal receptacles with circular bottom plates, forinstance barrels, the circular bottom plates are commonly stamped out ofquadrangular sheet metal plates. The waste resulting from thismanufacturing method amounts to approximately 25% of the weight of thematerial. For this reason four cornered receptacles were frequently usedfor economys sake, although for the special purpose a receptacle ofcircular cross section would be better. In certain cases, for instancewith heavy barrels which have to be rolled, it is impossible to dowithout the circular cross section of the sheet metal receptacle.

The method which will be hereinafter described serves to produce acheaper sheet metal barrel, adapted to be rolled, and stronger than thebarrels mentioned above.

The method consists. in starting from sheet metal strips which can beworked almost without waste and which may be them selves waste fromsheet metal plates which have been used for other purposes.

In the accompanying drawing:

Figs. 1 and 2 show each in plan view and cross section a sheet metalstrip to be used in this manufacturing method.

Fig. 3 shows a bottom plate for a barrel of circular cross sectioncomposed of triangular pieces, and I Fig. 4 shows a bottom platecomposed of trapezoidal pieces.

The sheet metal strips a shown in Figs. 1 and 2 are reinforced bylongitudinal grooves 8. Such a sheet metal strip a is cut intotriangular pieces at (Fig. l) or into trapezoidal pieces t (Fig. 2).From one kind of pieces (Z or t as sectors the circular plate iscomposed. The joints of the several sectors are united for instance byWelding. In this manner a solid bottom (Fig. for a sheet metalreceptacle of circular cross section is produced if the triangularsectors d from the strip shown in Fig. 1 are joined together. If thetrapezoidal pieces 25 of the strip shown in Fig. 2 are joined together abottom plate for a barrel is .produced which, as shown in Fig. t,'has acentral opening.

The polygonal plates shown in Figs. 3 and 1 can be used already asbottom plates for barrels in most cases as their circumference willdepart only very little from the circular shape if ii-sufficiently greatnumber of pieces is used. If however an absolutely circular form isnecessary there will be only very little waste, indicated in Figs. 3 and4: by m.

The radial seams and tangential grooves of the polygon reinforce thebottom plate so that thinner sheet metal than hitherto can be used, theresistance being nevertheless increased. The reinforcing by the radialseams and tangential grooves is much more effective than the reinforcingby concentric grooves Which is sometimes used for circular bottomplates.

I claim A method for the manufacturing of circular bottom plates forsheet metal receptacles consisting in cutting into radial triangularpieces strips of sheet metal rein forced by longitudinal grooves, inputting these radial triangular pieces together to form a circular plateand in uniting the same at the joints.

. In testimony whereof I afiix my signature in presence of twowitnesses.

MAX SIN GEWVALD.

Witnesses:

GoRDoN A. HIGGINS, RUDOLPH FRIoKE.

